Mellifiq works with air and water purification and has previously had chemical engineering students from various universities with them for projects specifically in the treatment of air and water. Their announced projects cover everything from product development, drug purification, treatment of micropollution in water, industrial air purification and recycling of cooling water. Links to the page here if you want to read more: https://mellifiq.com/sv/karriar/examensarbete-pa-mellifiq/